Finding minima in data as well as values near it

I have a column of data (zpoint) and I need to find all the minima (valleys) in the data.

For every minima, need to find the previous data point and the next data point using a 'for' loop and 'if' constructs.

For example, if the data is

17

12

3

15

46

I need the script to find the 12 and 15

Answer 1

[KSSV]

Read about min. Let A be your array.

[val,idx] = min(A) ;
iwant = [A(idx-1) A(idx+1)]

Answer 2

[Ameer Hamza]

This will find all the local minima and the points around it.

x = [17 12 3 15 46];

idx = islocalmin(x);
idx = idx | circshift(idx, 1) | circshift(idx, -1);

values = x(idx);

Result

>> values
values =
    12     3    15